CVE-2026-0263: A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unaut

Q: How do I fix CVE-2026-0263?

pan-os: upgrade to 11.1.4, 11.1.6, 11.1.10, 11.1.13, 11.2.4, 11.2.7, 11.2.10, 12.1.4, 12.1.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-0263 being exploited?

CVE-2026-0263 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-0263 affect?

CVE-2026-0263 affects pan-os. Severity is critical (CVSS 9.8). A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unauthenticated network-based attacker to execute arbitrary code with elevated privileges on the firewall, or cause a denial of service

Q: How urgent is CVE-2026-0263?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-0263 is a critical-severity flaw (CVSS 9.8) affecting pan-os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unauthenticated network-based attacker to execute arbitrary code with elevated privileges on the firewall, or cause a denial of service (DoS) condition. Panorama, Cloud NGFW, and Prisma® Access are not impacted by these vulnerabilities.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-05-13
Last modified	2026-10-26

Publisher (CNA): Palo Alto Networks, Inc. · Vendor: paloaltonetworks

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 18:16 UTCPublished CVE record published
2026-10-26 17:10 UTCUpdated Record last modified

paloaltonetworks pan-os UPGRADE

Affected: >= 11.1.0 and < 11.1.4 · >= 11.1.5 and < 11.1.6 · >= 11.1.8 and < 11.1.10 · >= 11.1.11 and < 11.1.13 · 11.1.4 · 11.1.4 h1 · 11.1.4 h10 · 11.1.4 h11

Fixed in: 11.1.4, 11.1.6, 11.1.10, 11.1.13, 11.2.4, 11.2.7, 11.2.10, 12.1.4, 12.1.7

Safe to downgrade to: a release before 11.1.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-0263?

pan-os: upgrade to 11.1.4, 11.1.6, 11.1.10, 11.1.13, 11.2.4, 11.2.7, 11.2.10, 12.1.4, 12.1.7. Exact commands for each OS are on this page.

Is CVE-2026-0263 being exploited?

CVE-2026-0263 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-0263 affect?

CVE-2026-0263 affects pan-os. Severity is critical (CVSS 9.8). A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unauthenticated network-based attacker to execute arbitrary code with elevated privileges on the firewall, or cause a denial of service

How urgent is CVE-2026-0263?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Palo Alto PAN-OS vulnerabilities

Related CVEs

CVE-2026-0300 CRITICAL 9.8 EXPLOITED MITIGATE MITIGATE Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability
CVE-2026-0265 HIGH 8.1 UPGRADE MITIGATE An authentication bypass vulnerability in Palo Alto Networks PAN-OS® software enables an unauthenticated attac
CVE-2026-0264 CRITICAL 9.8 UPGRADE MITIGATE A buffer overflow vulnerability in the DNS proxy and DNS Server features of Palo Alto Networks PAN-OS® Softwar
CVE-2026-0261 HIGH 7.2 UPGRADE MITIGATE Multiple command injection vulnerabilities in Palo Alto Networks PAN-OS® software enable an authenticated admi
CVE-2026-0262 HIGH 7.5 UPGRADE MITIGATE Multiple denial of service vulnerabilities in Palo Alto Networks PAN-OS® software allow an unauthenticated att

References

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